Micrometer-caliper.



E. S. SAVAGE. MIGROMBTBR CAMPER. APPLICATION FILED DBO. 20, 1913.

1,1 07,203. Patented Aug. 11, 1914,

TH'E AORRIS PETERS Co.. PHOTU-LIT'HU.. WASHINGTON4 D. c.

EDWARD S, SAVAGE, OF ROCHESTER., NEW YORK.

MIGROMETER-CALIPER.

Specification of Letters Patent.

Application filed December 20, 1913. Serial No. 807,959.

To @ZZ whom it may concern Be it known that I, EDWARD S. SAVAGE, a citizen of the United States, and resident of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Micrometer-Calipers, of which the following .is -a specification.

This invention relates to micrometercalipers or measuring-tools of the type in l which a screw-threaded spindle is rotated by means of a manually-operable handle or barrel, the position of the spindle or screw being indicated by means of graduations or other indicating 'devices coperating with the barrel.

In a micrometencaliper invented by me and disclosed in a pending application, for Letters Patent of the United States, filed May 19, 1913, Serial No. 768,566, I employA a construction and arrangement of parts by which longitudinal movement of the barrel is avoided, the barrel being connected with the micrometer-screw by sliding connections which compel the screw to rotate with the barrel while permitting relative longitudinal movement.

One object of the presentinvention is to provide a micrometer-caliper, so constructed, with improved means for adjusting the caliper to cause it to indicate correctly the position of the screw, whereby I avoid the necessity of using an adjustable anvil in the usual manner. To this end I interpose, between the micrometer-screw and the barrel, connectingdevices which normally cause the screw to rotate in unison with the barrel, but which may be loosened so as topermit relative rotation of these parts, thus permitting the barrel and the indicating-devices coperating therewith to be adjusted to conform accurately7 to any definite position in which the screw is temporarily held during the adjusting operation. v

Another object of the invention is to pro` vide a micrometer-caliper with a simple and effective device for locking it in any position in which it may be set. This novel lockingdevice is applicable to micrometer-calipers of various forms, but may be most conveniently applied to a caliper of the particular type in question, since it is adapted conveniently to cooperate with a barrel which does not move longitudinally. The locking-device comprises an annular member, rotatable about the axis of the micrometer-screw and the barrel, and provided with one or more `ber adapted to simultaneously engage such inclined surface and the outer surface of the z barrel or other rotatable part of the caliper, yso that by forcible rotation of the annular 4 member the clamping-member may be forced jinto clamping engagement with such rota- 3 table member, to lock it frictionally against i rotation.

l is a side-elevation, partly in vertical secltion, of a portion of a m1crometer-cal1per g embodying the present invention; and Figs.

2 2 and 3 3, respectively, in Fig. l, looking from left to right.

` The invention is illustrated as embodied 3in a micrometencaliper of a general form yjusual, a yoke 4, of which one end only is illustrated, and a screw-threaded Spindle or micrometer-screw 5 which is movable within the usual screw-threaded sleeve 6 iXed to the yoke. The screw 5 is turned, in the usual with the screw.

As in the device of my said application, the barrel 7 is not fixed to the longitudinally the screw may move longitudinally within it. 5 A longitudinal slot or keyway 8, in the barrel, receives a key 9 fixed to the end of the screw, however, so that when the barrel is rotated the screw is caused to rotate with it, and thus to move lengthwise through the sleeve ,6 in the operation of setting the caliper.

' Any convenient means may be employed for preventing longitudinal movement of the barrel 7 but in the illustrated caliper this is accomplished by connecting the barrel with direct-reading indicating-mechanism comprising a series of graduated rings. One of these rings, designated by the referencenumber 10, is fixed to the barrel and rotates within a casing ll, which has a reduced eX- tension 12 in which the barrel is ournaled; i and the ring 10by its engagement with the casing and with other parts of the indicati Patented Aug. 11, 1914.

inner beveled surfaces, together with a me1n- In the accompanying drawings :`I*`igure Q2 and 8 are vertical sections on the lines lwhich is familiar, this caliper having, as

manner, by the rotation of a barrel 7 coaxial movable screw 5, but `is made hollow, so that the screw.

ing-mechanism, prevents endwise movement of the barrel, while'leaving it free to rotate. rIhis indicating-mechanism may be of any ordinary or suitable form, and accordingly it is not particularly described or illustrated herein.

The novel construction, constituting a feature of the present invention, by which I provide for the adjustment of the caliper, resides in an arrangement by which the key 9 is secured to the screw 5. This key is integral with a head 13 having a cylindrical shank 14 which lits in a recess in the end of A binding-screw, 15, threaded into the head 18, is provided with a conical extremity cooperating with a conical surface wit-hin the cleft extremity of the shank 14. Accordingly, whenthis screw is driven inwardly it expands the shank, so as to bind it tightly to the screwand thus lock the key and the screw together. When adjustment of the caliper is necessary, however, the screw 15 is loosened, and the head and the key may then turn relatively to the micrometer-screw 5. To adjust the caliper it is then necessary only to set the screw against a gage of predetermined diameter, or against the anvil of the caliper7 and then hold it in this position while turning the barrel 7 un- ;SO .Et-il' the indicating-mechanism shows the proper dimension. The screw 15 is then tightened to set the parts in adjusted position. To afford access, when necessary, to the screw 15, while closing. the barrel nor- F-lilmally against the admission of foreign substances, a removable plug 16 is screwed into the end of the barrel. Accidental end-wise movement of the shank 14 with respect to the screw is prevented by a pin 2O fixed in r40 Ethe screw and engaging an annular groove in the shank.

The locking-device, constituting the second feature of the invention, comprises a ring 1S which is mounted rotatably upon the extension 12 of the casng- This fing is P110' vided with a continuous recess in its inner surface, and this recess, as shown particularly in Fig. 2, comprises two opposite portions of gradually increasing depth, the bottoms of these portions being thus formed by inclined surfaces. Cooperating with the ring 18 are two clamping-members 17 in the form of short cylindrical pins, which are mounted to slide radially in perforations in the extension 12. These pins extend into position to engage simultaneously the outer surface of the barrel 7, and t-he inclined inner surfaces of the ring. Vhen the ring is in the normal position shown in Fig. 2 the pins coincide with the portions of greatest depth in the recesses, and are not subjected to any endwise pressure, so thatv the barrel may be rotated freely. But when the ring is turned in a clockwise direct-ion from the position of Fig. 2, the inclined surfaces force the clamping-members with increasing pressure against the surface of the barrel, thus locking itfrictionally against rotation.

In assembling the caliper the locking-ring is slipped into place upon the casing, and the pins are then placed as shown in Fig. 2. The barrel is then introduced, and thereafter the ring is retained in place by its engagement with the pins, and cannot become disengaged therefroln so long as the barrel remains in position. Accordingly, my improved lock is very simple in construction, while its parts are effectively held in their operative relation.

I claim 1. In a micrometer-caliper, the combination of a micrometer-screw, a manually-rotatable barrel, means for preventing longitudinal movement of the barrel, and longitudinal sliding connections between the barrel and the screw to cause the screw to rotate with the barrel, said connections comprising members relatively rotatable to permit relative adjustment of the barrel and the screw, and means normally retaining said members against such relative rotation.

2. In a micrometer-caliper, the combination of a micrometer-screw, a manually-rotatable barrel provided with a longitudinal keyeway, means for preventing longitudinal movement of the barrel, a key coperating with said key-way and rotatable relatively to the screw, and means normally fixing the key to the screw against such relative rotation, said means being adapted to be loosened to permit such relative rotation for the purpose of adjustment.

3. In a micrometer-caliper, the combination of a micrometer-screw, a manually-rota table barrel provided with a longitudinal key-way and with a removable end-closure, a key cooperating with said key-way and rotatably connected with the micrometerscrew, and means, including a bindingscrew, for fixing the key normally against rotation with respect to the micrometerscrew, said binding-screw being accessible through the end of the barrel when said end-closure is removed.

4. In a micrometer-caliper, the combination, with a fixed part and a part rotatable with the micrometer-screw, of a locking-device, for locking said parts together comprising a clamping member non rotatably connected with said fixed part but movable radially into clampingengagement with said rotatable part, and a rotatable annular member having an inclined surface coperating with the clamping-member and adapted to force it inwardly upon a partial rotation of the annular member.

5. In a micrometer-caliper, the combination, with a part rotatable with the micrometer-screw, and a ixed annular member surrounding said part and provided with radial perforations, of members mounted slidingly the sliding members inwardly into looking in said perforations and adapted to engage engagement With the rotatable part upon a 10 the outer surface of said rotatable part, and partial rotation of the rotatable annular a rotatable annular member surrounding the member.

ixed annular member and having a recess7 EDWARD S. SAVAGE.

in its inner surface, eoperating with the lNitnesses: outer ends of the sliding-members, and pro- FARNUM F. DonsnY, vided with inclined surfaces adapted to force D. GURNEE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

